I just took another look on their website, but this is the first I'm hearing of it. I was unaware you could buy directly from PS. I didn't see anything on their website. Do you happen to have a link?
I'm in the same boat as OP and was originally looking at the 7000BT unit because of the only requiring an additional harness from my existing intercom.
After speaking with a couple shops I found that sometimes the intercom wiring needs to be redone regardless, which essentially puts you in the...
It'll work about as well as your phone if you have data. I've gotten some luck with different providers, but up above a few thousand feet you wont see much signal.
You might need to redo the roll centering? Had a similar issue where my NAV worked but I was always in a turn in heading mode. You can do this test on the ground and takes 10-15 mins. I can't post any links yet, but if you Google 'Aeroelectric STEC' you should see the service manual as the first...